Cloud and pour point of lubricant, Chemical Engineering

Q. Write short notes on cloud and pour point of lubricant.

Ans. Cloud and pour point of lubricant: When the temperature is lowered up to a particular point, the oil becomes cloudy in appearance. This temperature is called cloud point. When the temperature is further lowered up to a certain temperature, the oil ceases to flow or pour or becomes semisolid. This temperature is known as pour point. Important example of cloud and pour points are refrigerator plants and aircraft engines, which may be required to start and operate at and sub zero temperatures. The apparatus employed for the determination of pour point is pour point apparatus. It consists of following parts:

1.      Flat bottomed tube: It is made of glass and has standard dimensions.

2.      This tube is enclosed in a glass or metal jacket which is firmly fixed in a cooling bath having suitable freezing mixture.

Working: Test oil is filled inside the tube. Thermometer is adjusted inside the oil and in the cooling bath and cork bath is fitted to the mouth of flat bottomed tube. The tube is then kept in the freezing mixture. The freezing mixture is prepared as below:

Mixture

Composition

Temperature range

      A

Ice + water

Up to + 100C

     B

Ice + NaCl

Up to - 100C

     C

Ice + CaCl2

Up to - 250C

    D

Solid CO2 + Acetone

Up to - 600C

With every degree fall of temperature of oil, the tube is taken out and observed for a moment. The temperature, at which hazy appearance give cloud points. Cooling process is continued till oil stop flowing. That temperature is pour point.

Posted Date: 7/21/2012 8:02:58 AM | Location : United States







Related Discussions:- Cloud and pour point of lubricant, Assignment Help, Ask Question on Cloud and pour point of lubricant, Get Answer, Expert's Help, Cloud and pour point of lubricant Discussions

Write discussion on Cloud and pour point of lubricant
Your posts are moderated
Related Questions

What is meant by crystal imperfections? Crystalline solids have a very regular atomic structure: that is, the local positions of atoms with respect to each other are frequent a


Where can I get the solution manual for bioprocess engineering by Schuler and kargi? Any link to download it?

how to perform a project on bechamp reduction?

Which one of the following statements is correct? You may wish to examine a molecular model of this compound. 1. Carbon G is an asymmetric center and its configuration is R 2


WHATS THE MOLARITY OF SEAWATER

application of neutral refractory

which are the different types of commercial cells?